Restructure of expanded cork with fumed silica as novel core materials for vacuum insulation panels

Jiandong Zhuang, Seyed Hamidreza Ghaffar, Mizi Fan*, Jorge Corker

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

Using expanded cork dust as a cheaper substitute of fumed silica, the expanded cork/fumed silica composites with hierarchical porous structure were designed and constructed as an alternative lower cost material for vacuum insulation panel (VIP) core. A novel strategy compromised of microwave pretreatment and vacuum impregnation method is developed for cork restructuring and recombination. The morphology, microstructure and thermo-physical properties of expanded cork/fumed silica composites were thoroughly investigated. It is found that the microwave pretreatment is a rapid and effective method to restructure cork, and then fumed silica can be introduced into the cork pores efficiently by the vacuum impregnation method, resulting in a hierarchical microstructure of cork micro-pores and nano-porous fumed silica micelle. Thanks to this unique hierarchical porous structure, the hybrid expanded cork-fumed silica materials show an excellent thermal insulation property (as low as 6.3 mW/m·K at pressure < 1 mbar). The results demonstrate that the proposed strategy is an efficient means to construct a hierarchical porous expanded cork/fumed silica hybrid network system, and the as-prepared composites could have a potential application for VIPs core materials due its cost-effective and good thermal insulation performance.

Original languageEnglish
Pages (from-to)215-221
Number of pages7
JournalComposites Part B: Engineering
Volume127
DOIs
Publication statusPublished - 15 Oct 2017

Bibliographical note

Funding Information:
The research is supported by the European Union's Seventh Framework Program managed by REA-Research Executive Agency [FP7-SME-2013], under the GA No. 606037.

Publisher Copyright:
© 2017 Elsevier Ltd

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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